Home / 20,877.66-28,778.46-15,821.64

Finding the Fourth Proportional to 20,877.66, 28,778.46 and 15,821.64

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Solution

The fourth proportional to 20,877.66, 28,778.46 and 15,821.64 is: 21,809.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,877.66 : 28,778.46 = 15,821.64 : x
  2. Step 2: Convert to fraction form
    20,877.66/28,778.46 = 15,821.64/x
  3. Step 3: Cross multiply
    20,877.66x = 28,778.46 × 15,821.64
  4. Step 4: Simplify right side
    20,877.66x = 455,322,433.87
  5. Step 5: Solve for x
    x = 455,322,433.87/20,877.66
  6. Step 6: Final answer
    x = 21,809.07

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.